BMW M60

BMW M60 engine
Alpina B8 engine (based on the BMW M60)
Overview
Manufacturer BMW
Production 1992–96
Layout
Configuration DOHC 90° V8
Chronology
Predecessor BMW OHV V8
Successor BMW M62

The BMW M60 is a naturally aspirated V8 DOHC engine which was BMW's first V8 in over 25 years and was produced from 1992 to 1996. It was replaced with the M62 engine.

Development

During the 1970s, BMW produced a prototype V8 engine for the E23 7 Series, however this engine did not reach production.[1]

Development of the M60 began in 1984,[2] and 560 test engines were built during the development program. The design process used CAD to minimize the size and weight of the engine.

Design

The M60 engine has double overhead camshafts with four valves per cylinder. The camshaft is driven by a dual-row timing chain[3] with a self-adjusting tensioner. Valves had hydraulic lash adjustment to reduce maintenance. Fuel injection and ignition are controlled by the Bosch Motronic 3.3 system, and the ignition system is a coil on plug design with knock sensors.[4][5]

To reduce weight, the engine uses aluminum for both the engine block and cylinder head, magnesium valve covers[6] and a plastic intake manifold.[2] The M60 was BMW's first car engine to use a "split conrod" design,[2] where sintered connecting rods are made as a single piece and then fractured in order to ensure a closer fit.[3] Total dry weight of the engine is between 175 kg (386 lb) and 203 kg (448 lb).[6][2]

Alpina

Alpina built a high compression(10.8: 1) version of the M60B40, that was used in the BMW Alpina B10 4.0 (Sedan and Touring) and B11 4.0[7] and in some B8 4.0's for the Japanese market,[8] with an output of 232 kW (311 hp) in the B10 4.0.[9]

The engine's displacement was later enlarged to 4619 cc, this engine was used in the B8 4.6[8] (Sedan and Touring) it is also used, in the B10 4.6.[10] This variant in the B10 has an output of 250 kW (335 hp)[9] and in the B8 due to a changed exhaust system has 245 kW (329 hp).[8]

Models

EngineDisplacementPowerTorqueRedlineYear
M60B302,997 cc (183 cu in)160 kW (215 bhp)
@ 5800rpm		290 N⋅m (214 lb⋅ft)
@ 4500rpm		65001992
M60B403,982 cc (243 cu in)210 kW (282 bhp)
@ 5800rpm		400 N⋅m (295 lb⋅ft))
@ 4500rpm		65001992

M60B30

The M60B30 has a bore of 84 mm (3.3 in) and a stroke of 67.6 mm (2.7 in),[2] for a displacement of 2,997 cc (183 cu in). Compression ratio is 10.5:1, giving an output of 160 kW (218 PS; 215 hp) at 5800 rpm and 290 N⋅m (214 lb⋅ft) at 4500 rpm.[11]

Applications:

M60B40

The M60B40 has a bore of 89 mm (3.5 in) and a stroke of 80 mm (3.1 in),[3] for a total displacement of 3,982 cc (243 cu in). Compression ratio is 10.0:1,[3] giving 210 kW (286 PS; 282 hp) at 5800 rpm and 400 N⋅m (295 lb⋅ft) at 4500 rpm.[12] It had a forged crankshaft.

Applications:

Nikasil damage from high-sulfur fuels

BMW used Nikasil- an aluminium, nickel, and silicon alloy- to line the cylinders of the M60 engines. In fuels with high sulfur content (such as used fuels sold in the United States, UK and South America), the sulfur damages the Nikasil bore lining, causing the engine to lose compression.[13]

BMW replaced engines under warranty and Nikasil was eventually replaced by Alusil.[13]

In the USA and UK, sulfur rich fuel is being phased out.[14][15]

Nikasil engines are unlikely to be a problem today, as cars with affected engines are off the road or have received replacement engines.[16]

References

  1. ↑ "The Lost BMW V8 and V12 Engines From the 1970s". www.unixnerd.demon.co.uk. Retrieved 16 June 2017.
  2. 1 2 3 4 5 "BMW M60 engine". www.usautoparts.net. Archived from the original on 4 November 2013.
  3. 1 2 3 4 "SBT 4.0 Liter V8 Engine – M60" (PDF). Retrieved 16 June 2017.
  4. ↑ "BMW M60B40 Engine". www.mywikimotors.com. Retrieved 15 June 2017.
  5. ↑ "BMW M60 and M62 V8 Engines". www.unixnerd.demon.co.uk. Retrieved 16 June 2017.
  6. 1 2 "BMW M60 and M62 engines". www.drive-my.com. Retrieved 15 June 2017.
  7. ↑ "E34 B10 4.0". www.alpina-archive.com. Retrieved 25 March 2017.
  8. 1 2 3 "E36 B8 4.6". www.alpina-archive.com. Retrieved 25 March 2017.
  9. 1 2 "ALPINA Automobiles based on BMW 5 Series E34". www.alpina-automobiles.com. Retrieved 25 March 2017.
  10. ↑ "E34 B10 4.6". www.alpina-archive.com. Retrieved 25 March 2017.
  11. ↑ "Engine specifications for M60 engines". www.bmwheaven.com. Retrieved 16 June 2017.
  12. ↑ "M60 V8 engine". www.bavtech.com. Archived from the original on 24 February 2014.
  13. 1 2 "BMW World – Nikasil". www.usautoparts.net. Archived from the original on 12 August 2014.
  14. ↑ "Tier 2 Vehicle & Gasoline Sulfur Program". www.epa.gov. Archived from the original on 26 October 2010.
  15. ↑ "No fuel like a low-sulphur fuel". www.telegraph.co.uk. Retrieved 6 November 2010.
  16. ↑ "The BMW V8 Nikasil myth". www.meeknet.co.uk. Retrieved 6 November 2010.
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